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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc9077776992e7d88b77ac6488b6b1baf86e7227eed332b5946be640e042a19' 
  AND token = '55Dpslf8CFi+M/P/tyd7QDt/DLw0+3DXf/zkGO3LR2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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