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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1abe2a631e53a9a28350ef49ff7c12151b48ca8f8b0c17ae6119932e78552764' 
  AND token = 'L2wdCFy6nLjDtFmtCDTw8ifL14uWdAeNgwsEGHAbFlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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