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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98446dcb05fd814839b9b89f464a490001e5371f47415f7db41a3c692fe1f1b7' 
  AND token = 'g3AyVI/4ieegfCB5sPNtE+uJ1zzSj3iO8ZG+7o4ZHY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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