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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456228c9cf79b67d8fb59d2f332d1be43e449ac3a0b613033bbbac363db54e76' 
  AND token = 'jKv2LXdLqaCWoFf/OZZxZ2WM2E5GzalazKE4VPE1M2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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