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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b2fae47fd11aa64dffbdac09add837609575f0d0cda7a33adb2ffed9d3c65b' 
  AND token = '0gkK0JkDAsB12XTb4p1lLErUE/oPjk0gtuqV0r/vZrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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