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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff4d7260ca629840b6d4cc7f7b73258d5ab4f900aff2894d559aa4c0c92528d' 
  AND token = 'cJx2bo1eEEI0QErDbVfun34m01ZA4sd8w8FY65xeMjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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