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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe6fa71eb296c4f96c889f642ca79bfc9a88f6b12ce2fb3813efacbb54bc48c' 
  AND token = '4E4Fz4znczsT5+7ZlpjGJRCcggZZSSahIpE/G8nlzi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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