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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabda24ef45242f316fe976ec38719156782015604b44caf38921333491ddd3c' 
  AND token = '5P/p+4d/WKf6olLlH8knyBgl0yTuQXoxU3brDdUGJ8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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