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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76eb1e9c05af2a822c19894c45b5e1d3c106126c5690809f124852878384bbee' 
  AND token = 'XHw9AyB2hfv9wxcczHNLnwcW9GeLPUZe2FeGI07RkyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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