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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0b55407e535d5bd78393d4103038e5ee3b68680b7b7878c9873a5c215e9c63' 
  AND token = 'nnBWU+qqk3pJYan7MCsUmaHwUADHsU0XK6SGlLdsFaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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