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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3048216c79c9c96d0c9a1cef79032cedea1b087d773628caf5dcfd4a0741016b' 
  AND token = 'FvV4u7SD2Evy1T4N7Evd1Kpn9ch1rYgllJs+jT9TwF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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