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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa405f771e325e3648230f86d2059bf2b8ada97735833cb8f7cd861a565c8f41' 
  AND token = 'EUOt/eUFQnCWeySX9CSaAvopT7R2N4IO6SHbWl5mN70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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