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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b3c112166439f9ff734b985531ba7c8afdb9bf3a941280e0e49d388fcbf6f7' 
  AND token = '2jHXFvr7wN9OIlkyg3PQNA3ZRLyaBAYG4Mq1eebe6qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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