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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4f074401ba9c837460230afffdeeb4d1cba26f5398816cfc0a0c21bf1f4f85' 
  AND token = 'CYbodil5oxHMWi7/gwc8CvW9jczCqkP0HI3reV87H9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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