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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff7afd925c912a3cc1505d76b4834c2c0e39309a35a31bf6436afd53d4f04b4' 
  AND token = 'e0zikW0sCWJ9JqEtcJpms6z1lskHvc/gFqeh4jvb1SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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