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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687f1f1896e3b6e525ff32ac641462185de964bc7fffe584e3adc28650fc8e56' 
  AND token = 'bFkdioWkRS/W8MDIWdniPdEWlwfiHC5kjKeP8bLmpvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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