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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c02cd61e3b2559742a28c7590fd9947dfb154f7ecc3fff8fc8cfe726cf9add' 
  AND token = 'i3SOQ5uhjF6MkhqLjunXbCsi+OUgEczH95gKu3rPYjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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