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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c0b09825158f590781b6416e81a6f968e8e9ed88a1c968b756e9d5f13879c4' 
  AND token = 'na/0O8LTJ1t1HyZJx5yeIYlc/H8kXIfpLFsaTwRdYWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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