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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283057c7d7e464ccfa8e619e5ebe02965533eda972c5154cce7f3241e90cddd9' 
  AND token = 'xDu53OKOTGqrJ3LfjLCqTzuJ8s2exV7OFOFCvGv8w/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00357

JSON explain

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