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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2944e01647ef5b03a15b9deb8015444a4deceae3d3373f81483a7eea2a2f072e' 
  AND token = 'hnMfY0L4V4v24qnZbjgDkgmu34gLroSgiLbNjxyJ8Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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