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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ccfd9bb17cd5f55b5c9854283cbaed8bd323d53fb506891f54f050fd96d1e2' 
  AND token = 'LcQ2q2EiHI3c/X5IyWXrPkofZhHxHpaI08H5U0Vie2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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