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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4417c842fb7c02d359ede40c245dfc07d2ec3d989ba3487ef9ebc6f032b8910' 
  AND token = 'jFLUtCelAq3mEcHloL1otx2ApzJMQIkP6/jbw9f+TOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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