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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd92e0bc3631913391c93bdea7991728186de9d7df83b39283e790659bd29980' 
  AND token = 'KEyYGZi/9Aqiz5+9VhOOuTBdYnj0tMl4CHRrYcehQ7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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