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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5118332f3b7e11ae15b6a85d2e374f4be1af52bf4cc46cc1d4988a80f428a43' 
  AND token = '/4lfiI3XtMJv26Knv47eaSoKogu/1ub5DL2kGJ+SVV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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