Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fb28f972f32e4103a212e7aae459b3b6c8319e72e3a181840f9ffd33f8f9a1' 
  AND token = 'Ee6vtLoTkV+kwRkPSwj0t9gUAgb47fBD8yBhpS6v5UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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