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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf547e65e5be49ca01e73af6cce5113d48e77d6b42a3c049f1cf680d7ab3181' 
  AND token = 'AWbVVK7n66L1XdtIWtuKPaMTy0BThVCJOajuto+yLtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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