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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d08b2802bee1c9d9a4432d8e91740281785e691d18bbdbb3a57c5cad3bdf36f' 
  AND token = 'Dpef00hoNmppVHEcAQX5bzOEJxfZd7AgC8ZQTvZUZ+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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