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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f0535b24ca2e52be0aa3a20a23cf55a1235e6e8781dde0edaa5a85077711af' 
  AND token = '3Cb0s/IVITmcmCdy9lTerHyggoyXqy3jkxT16MKCPNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}