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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15fb65bde9ab194b337708fe849645703c137dcda131e88e1ff12197e72d47b7' 
  AND token = 'aL85xIDD2P5hWI2V4gqYKmx098YTa+UXJjJsCs8qxHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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