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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9358a5c89063de7c51886a3127a8800ddeb0ce6381b0f00ac1fb032c08a3f7e1' 
  AND token = 'iO1Ky/OuuQZaBYb+z0mzfNUMQHxSpRUmfhUJ5mVRKMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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