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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7eb7342d8f14084f1e89aa2940344a9c3c4a5155406c25b7e726ef31acf621' 
  AND token = 'oicBXeXzoi+E9v0M7WBVhW6e0rMmPlMFkvkTSJy8bKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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