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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebfb0bec5310d581ab51b8ff79cc517600c9d10fe01c331c69a6a34deb27d1ee' 
  AND token = 'uj8xmlKpwrGRrK36htPnts+zeTCuII+bptT4D+KPyE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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