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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a017ab70bdee9f4a5e61b07ff989aa6523e58755ce59af035f24d1bc9c09084d' 
  AND token = 'WrKOrOc0UDuFXtDQiY1c4mJ5nQ7qTM8dUfpCeCiVIfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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