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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb32437bd25dce840629344cd62a1d7783acbc58732357bac8b7695ff9cc74c' 
  AND token = '3ccgKDc3Z1xe38iJMO1uK0IO6Yku1KOMzXaas+Xs/lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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