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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6814703f7d95679926b44818724101af57295af6f7560cacf1871a45b69b6957' 
  AND token = '7Q1fJeIbF2hQZRaxnOyr7LU7YdecqEjTDi0oeUxAyLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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