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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9284a36cf83b09188e0ca8daf6c741968eb94b0b3ca284dc5a6190804156d70' 
  AND token = '+fzLFSECsKYUe43sJ3Q+uScJ36Ais49zgWQBu/UpNNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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