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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7024fa722dc55cc7665be6127f8f0a1aa01d07d3b13e83fb7fa367f3a8258d' 
  AND token = 'CiRXp/QkOfk8Vdn46bs4xFQ+I6EVWtMvC36sF5VnhZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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