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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a084fa69cc6fa26f1ad15ac157c53a294a7aee85998910f75e538104d781549' 
  AND token = 'dFDn4XZv39A+np4W5HaBpxbIDlu7VY1qTu37jGMZJbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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