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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15dc025ddd2a28d9e31b3fc2ecb8b472d5fe8c4d9eba28622b7f83200292168c' 
  AND token = '5any2t9Mf0Nz3H+mGysqZrdhrWiPvJN508VZSkWayRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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