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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f637268ecab915de41085d6a37eb5fa5a16335ac9a7d7855cff14c6cea6f22f2' 
  AND token = 'pMqwa5Dc63ky2IcfEqcPCA4f84eMuFNox+jRtJ4HIrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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