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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31648cc2b55d3f080227a031c5cdfddd2d4bde0caf7fad96a56f732d9d336338' 
  AND token = 'SaxV8aq8AxdCkq0azvFcKtp4vl9g+MC66sf2jpPrH80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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