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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e969ebfe65973fd92b1c6ef40ae9a37a84611afdf166c2c0950f9d0e8041d37' 
  AND token = 'pDn4+mn7AzgFn9N/A1c+n+Gok1xl12k57fSgqKcjAtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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