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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f251bbd0eb9a7a8f66b87b7a3c626edf611e3d2feb0a882edb13b96f7d86ea' 
  AND token = 'pT8T7maL3m3GV16K26duUn6khWjgKYMY3WCkS8oirzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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