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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da4f3a86b298536f75a0e6234ed9afbbb089c25a6486dc2b0bbfd4685621de1' 
  AND token = 'x5l+t+sv87edNYStgRYRM5apLR/NrJoEmPDUI6bVvDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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