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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd166e9d9f40b45b19ab0237253fa9a3304607ebb584be22a21c50e94f1119f' 
  AND token = 'DYfbUh0t5/Yp9JU5M47TkBLz7tHAwUk07PdQricEnYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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