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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318409f43ab3222cc069f6a385b33ff8494c6e6c88ec9b67f932ed5a5f6f2825' 
  AND token = 'Sl+Bjk88j4AjZB21XPoLcaKp9+gyIuGjDL6+DDuzfBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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