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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3855a507e9dca2e64c3b470f0608c26e0cb1a2ec596f4a33d4361a505e2c1a28' 
  AND token = 'cAxrmNdCOMnhVdw8VaVyt97jdjZotnDMDKR6A0q7u8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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