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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c8c4c117a728917852897c9368d86436c6f6e31713ba2aec233d7703821e14' 
  AND token = 'pJ6FQd53l8fXYOn5q01P9UCg80R/75JSNbq3GyR7WFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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