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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89bdc72b4b8106ef47cc80fe56a82a195d816dc233477f6cb5637a517505f1b' 
  AND token = 'yKH51ofa9CpkLH1npG9ImD2XveQ/QiSyT+q+Q2WbDZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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