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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0425834f197e6475418ea9c5d93465e3dfc25963ecef24bdc3d91b544268a30' 
  AND token = 'f4kpXjoMJS7QwHB8yzbGDSpba9HUkiUzlKZL+j1ua9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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