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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc59617c8c8f18e707bc79a9d154047247796adaeb19a85c22276a8d1e7fe72' 
  AND token = 'g48LhubPH0mg0qQ362OOM1J574ya8MZeFLfXDau3HZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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