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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824184ef73ef0fe76334b2f7e2c168234cd55564c11ebd47712e46dee9703096' 
  AND token = 'TdHFi8omyQYNodzFgeZADLj434PX8WadxDfzHGTK0Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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