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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ff97af8fa4a436a3003015dfa70b5cc26b3cf75cdd2be398aa9e2a0ad3b77ab' 
  AND token = 'cobeQiYaUL5mnZZYC45hQ0HAzoCGoh1ycJ7GxkLNFuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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