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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28c4e7c5adb7b191f567f9a208ab00d542db3282c32ec09ad6af0e92bae24c4' 
  AND token = 'ubTkAB3lVC2yDrUhjeuvBW2HAybSytsqI/VxDy9vqLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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