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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c363545ce9c6b7eb712903a9142df37f31d3a7d170469eafe935513d11d62564' 
  AND token = '8TJ7P9f5JRCGzRqj6V691NlK2aWZf1WyZfA0eJ44h2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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