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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b336bdd42e61ff60e813e50e15724320aa63bfe22531f7169969f09bcd4da9d' 
  AND token = 'aozDaWyB0iST66Ts9l34QpSoBSEq6S+K6XrkIsMyH+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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