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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8a776d9a66a7ee01da3d1e9fd9ccaaf1ea4c3990fcde12772112bef82858ce' 
  AND token = '0i5RAvGZpVgvS/MYggxHarSto3lVR3wuVHkrg/cdSGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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